A T-shaped cross-section column-type composite insulator device and its optimal cross-section size calculation method

Abstract

The present invention discloses a T-shaped cross-section column-type composite insulator device and an optimal cross-section size calculation method thereof. The device includes: an insulating core rod, a connecting fitting, and an insulating outer sheath. The cross-section of the insulating core rod is set to be T-shaped. The shape of the T-shaped cross-section includes a standard T-shaped cross-section and a T-shaped cross-section in which one or more straight lines of the outer contour are set as arcs with a preset curvature. The insulating core rod is used to ensure the mechanical performance of the insulator. The connecting fitting is used to connect the column-type composite insulator to the power transmission and transformation equipment component, so that the column-type composite insulator is reliably connected to the power transmission and transformation equipment component. The insulating outer sheath includes a plurality of umbrella skirts and a sheath. The insulating outer sheath is used to protect the insulating core rod. The umbrella skirt is used to increase the creepage distance of the insulator. The insulator device can be applied to AC and DC overhead transmission lines and substations with voltage levels above 1000V in the power, railway, and power plant industries.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and more specifically, to a T-shaped cross-section column composite insulator device and an optimal cross-section size calculation method thereof. Background Art

[0002] Currently, with the development of composite material manufacturing technology, the electrical and mechanical properties of composite materials have been greatly improved. In transmission projects of various voltage levels in China, column composite insulators have begun to be widely used, including line column composite insulators (also known as "composite insulation cross arms") and substation post composite insulators. The application of line column composite insulators has the main advantage of greatly improving the lightning withstand level of the line in the distribution network (10 kV) system, and in the main network (35 kV and above), it can effectively reduce the width of the transmission corridor and improve the economic benefits of the line. Column composite insulators are subjected to the combined action of electrical and various mechanical loads during operation. Currently, the cross-sections of commonly used column composite insulators are mainly solid circles, hollow circles, solid circular shapes, and hollow rectangles. However, in actual application, it is generally reported that the solid column composite insulators are relatively heavy in weight, which has a certain impact on the installation convenience, while the hollow column composite insulators have problems such as internal insulation, which has a certain impact on the safe and stable operation of the power transmission and transformation system. Summary of the Invention

[0003] In order to solve the problems in the background art that the existing solid column composite insulators are relatively heavy in weight, resulting in a large load on the components of the power transmission and transformation equipment and poor installation convenience, while the hollow column composite insulators have hidden dangers such as internal insulation and affect the safe and stable operation of the line, the present invention provides a T-shaped cross-section column composite insulator device and an optimal cross-section size calculation method thereof. The device obtains the optimal cross-section size by setting a composite insulator with a T-shaped cross-section and according to the optimal cross-section size calculation method, so that the T-shaped composite insulator obtains the smallest cross-section size while ensuring that it meets various strengths in the environment to be used, thereby reducing the weight of the composite insulator itself. The optimal cross-section size calculation method of the T-shaped cross-section column composite insulator includes:

[0004] Presetting the material strength design requirements according to the external load of the T-shaped insulator to be used and the axisymmetric characteristics of the T-shaped cross-section; the material strength includes bending strength, compressive strength, and tensile strength; the axisymmetric characteristics of the T-shaped cross-section include the design requirements for each region of the T-shaped cross-section determined by the centroid position and the axis of symmetry of the insulator;

[0005] Calculating the material strength of the T-shaped insulator according to the preset initial size of the T-shaped insulator cross-section and the insulator test parameters;

[0006] Determine whether the calculated material strength all meets the material strength design requirements;

[0007] If it meets, adjust the cross-sectional dimension of the T-shaped insulator according to a preset rule to reduce the cross-sectional area of the T-shaped insulator, calculate the material strength under this cross-sectional area, and compare it with the material strength design requirements; if it still meets, continue to adjust the cross-sectional dimension and determine again whether it meets the material strength design requirements until it does not meet the material strength design requirements;

[0008] When it does not meet, take the cross-sectional dimension that last met the material strength design requirements as the optimal cross-sectional dimension of the T-shaped column composite insulator;

[0009] Furthermore, the determination of whether the calculated material strength meets the material strength design requirements includes:

[0010] If the material strength calculated according to the initial cross-sectional dimension does not meet the material strength design requirements, adjust the cross-sectional dimension of the T-shaped insulator according to a preset rule to increase the cross-sectional area of the T-shaped insulator, calculate the material strength under this cross-sectional area, and compare it with the material strength design requirements; if it still does not meet, continue to adjust the cross-sectional dimension and determine again whether it meets the material strength design requirements until it meets the material strength design requirements;

[0011] Take the cross-sectional dimension that meets the material strength design requirements as the optimal cross-sectional dimension of the T-shaped column composite insulator;

[0012] Furthermore, the adjustment of the cross-sectional dimension of the T-shaped insulator according to a preset rule includes:

[0013] On the premise of ensuring that the maximum horizontal length and the maximum vertical length of the cross-section of the T-shaped insulator remain unchanged, enlarge or reduce the area of the cross-section according to a preset adjustment coefficient;

[0014] The shape of the T-shaped cross-section includes a standard T-shaped cross-section and a T-shaped cross-section with an arc with a preset curvature set on the upper edge;

[0015] Furthermore, the determination of whether the calculated material strength all meets the material strength design requirements includes determining whether the flexural strength meets the flexural strength design requirements:

[0016] The flexural strength judgment formula is:

[0017]

[0018] where M x and M y are respectively the preset bending moment design values about the X-axis and the Y-axis, f cis the design requirement for the bending strength of the insulator; the W x and W y are the section modulus of resistance to bending about the X-axis and the Y-axis respectively, and the section modulus of resistance to bending is obtained by calculating according to the section size;

[0019] Furthermore, judging whether the material strength obtained by calculation meets the material strength design requirements includes judging whether the compressive strength meets the compressive strength design requirements:

[0020] The compressive strength judgment formula is:

[0021]

[0022] wherein, N is the design value of the axial tension or pressure of the insulator, A is the area of the gross cross-section of the insulator, φ is the stability coefficient of the insulator under axial compression, M is the preset design value of the bending moment, W is the section modulus of resistance to bending, and f p is the design requirement for the compressive strength of the insulator;

[0023] The stability coefficient is obtained by calculating the slenderness ratio, compressive strength and compressive elastic modulus of the insulator; the section modulus of resistance to bending is obtained by calculating according to the section size;

[0024] Furthermore, judging whether the material strength obtained by calculation meets the material strength design requirements includes judging whether the tensile strength meets the tensile strength design requirements:

[0025] The tensile strength judgment needs to simultaneously satisfy the following formulas:

[0026] and

[0027] wherein, N is the design value of the axial tension or pressure of the insulator; A n is the area of the net cross-section of the insulator; m is the eccentric reduction coefficient of the T-section insulator; M is the preset design value of the bending moment; W is the section modulus of resistance to bending, and the section modulus of resistance to bending is obtained by calculating according to the section size; f c is the design requirement for the bending strength of the insulator; f t is the design requirement for the tensile strength of the insulator;

[0028] The described T-section column insulator device includes:

[0029] An insulating core rod, the cross-section of the insulating core rod is set as a T-shape, and the cross-section size of the insulating core rod is obtained by calculating through a preset method according to the external load of its intended use environment and the axisymmetric characteristics of the T-section; the insulating core rod is used to ensure the mechanical performance of the insulator;

[0030] Connecting fitting, which is used to connect the post composite insulator and the power transmission and transformation equipment component, so that the post composite insulator and the power transmission and transformation equipment component are reliably connected;

[0031] Insulating jacket, which includes a plurality of umbrella skirts and a sheath, and is used to protect the insulating core rod; the umbrella skirts are vertically arranged on the sheath to increase the creepage distance of the T-shaped cross-section post insulator; the sheath is closely attached to the insulating core rod;

[0032] The axis of symmetry of the T-shaped cross-section post insulator device is perpendicular to the ground, and the application environment of the device includes a power scenario with axisymmetric stress;

[0033] Furthermore, the insulating core rod is integrally formed by thermosetting epoxy resin reinforced with glass fiber; the reinforcement methods include winding, drawing, and vacuum impregnation;

[0034] Furthermore, the connecting fitting is made of cast steel material with surface hot-dip galvanized treatment, and the connecting fitting and the made component are fixed by welding;

[0035] Furthermore, the insulating jacket is formed by thermostatic curing of silicone rubber in a preset mold; the forming methods of the plurality of umbrella skirts and the sheath of the insulating jacket include integral forming and forming by extrusion and threading through the umbrella process; the shapes of the umbrella skirts include circular and T-shaped;

[0036] Furthermore, the insulator device includes one or more series-connected insulating core rods, and the plurality of insulating core rods are connected by connecting fittings;

[0037] Furthermore, the connection method between the insulating core rod and the connecting fitting is fixed connection through bolts and limit grooves; one section of the insulating core rod has bolt holes and limit grooves matching the connecting fitting, so that after the insulating core rod and the connecting fitting are inserted together, they are fixed by bolts;

[0038] Furthermore, the connection method between the insulating core rod and the connecting fitting is fixed connection through a mortise and tenon structure; one end of the insulating core rod is inserted with the connecting gold through a mortise and tenon, and is fixedly connected by an insulating wedge nail arranged on the insertion surface;

[0039] Furthermore, the device includes one or more series-connected insulating core rods, and the plurality of insulating core rods are directly connected through a preset connection method; the connection methods include fixed connection through bolts and limit grooves and fixed connection through a mortise and tenon structure;

[0040] Further, one or more straight lines of the outer contour of the T-shaped cross-section of the insulating mandrel and the corresponding insulating jacket are set as curved lines with a preset curvature, and each right angle of the outer contour is set as an arc chamfer, so as to reduce the accumulation of foreign objects on the surface of the insulator.

[0041] The beneficial effects of the present invention are as follows: The technical solution of the present invention provides a T-shaped cross-section column-type composite insulator device and an optimal cross-section size calculation method thereof. The device is provided with a composite insulator with a T-shaped cross-section, and the optimal cross-section size is obtained according to the optimal cross-section size calculation method, so that the T-shaped composite insulator obtains the smallest cross-section size while ensuring that it meets various strengths in the environment to be used, thereby reducing the weight of the composite insulator itself, reducing the production cost of the product, and also reducing the load of the components of the power transmission and transformation equipment and improving the installation convenience. The insulator device can be applied to AC and DC overhead transmission lines and substations with voltage levels above 1000V in the power, railway, and power plant industries. By setting various connection methods between the insulating mandrels, the connection method can be selected according to actual needs in different situations to complete the connection, improving the installation flexibility and laying a foundation for the popularization of subsequent column-type composite insulators; the device and method reduce the accumulation of foreign objects on the surface of the insulator by setting a convex arc on the upper surface of the insulator, thereby reducing the operation risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The exemplary embodiments of the present invention can be more fully understood by referring to the following drawings:

[0043] Figure 1 It is a flowchart of a method for calculating the optimal cross-section size of a T-shaped cross-section column-type composite insulator according to a specific embodiment of the present invention;

[0044] Figure 2 It is a schematic diagram of a T-shaped cross-section column-type insulator device according to a specific embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] Now, the exemplary embodiments of the present invention will be introduced with reference to the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same unit / element is denoted by the same reference numeral.

[0046] Unless otherwise specified, the terms used herein (including scientific and technical terms) have the ordinary meaning understood by those skilled in the relevant technical field. Additionally, it can be understood that terms defined in commonly used dictionaries should be construed as having a meaning consistent with the context of their relevant fields, and should not be construed as idealized or overly formal meanings.

[0047] Figure 1 This is a flowchart of a method for calculating the optimal cross-sectional dimensions of a T-shaped column composite insulator in a specific embodiment of the present invention. The method calculates the material strengths of each part of the T-shaped composite insulator in the environment where it will be used, and obtains the optimal cross-sectional dimensions, so as to reduce the weight of the composite insulator itself while ensuring that the strength requirements are met. The method for calculating the optimal cross-sectional dimensions of a T-shaped column composite insulator includes:

[0048] Step 110: Preset the material strength design requirements according to the external load of the T-shaped insulator in the environment where it will be used and the axisymmetric characteristics of the T-shaped cross-section; the material strengths include flexural strength, compressive strength, and tensile strength; the axisymmetric characteristics of the T-shaped cross-section include the design requirements for each region of the T-shaped cross-section determined by the centroid position and the axis of symmetry of the insulator.

[0049] Taking this embodiment as an example, the preset material strength design requirements can be confirmed by the provisions in DL / T 1580-2016 "Technical Specification for Rod Core for AC and DC Rod Suspension Composite Insulators", and adjusted and modified according to the specific conditions of the environment where it will be used; for example, in extremely cold, extremely hot, high-altitude, high-humidity and other environments, a certain specific design requirement needs to be more stringent; in order to ensure the safety of the design, the overall design requirements can be tightened; further, the T-shaped cross-section is axisymmetric, but its centroid is located above its geometric center, which makes the stress conditions of the part above the centroid position and the part below the centroid position different, and the design requirements for the strength of each part need to be set separately according to the use environment.

[0050] Step 120: Calculate the material strength of the T-shaped insulator according to the preset initial dimensions of the T-shaped insulator cross-section and the insulator test parameters.

[0051] For the cross-section of the T-shaped insulator, an initial dimension needs to be preset first as the starting point for the optimal calculation. The initial dimension can be an empirical value of historical data to reach the optimal dimension corresponding to the external load in the environment where it will be used, and reduce the number of calculations.

[0052] The insulator test parameters include parameters obtained through test calculations for calculating material strength, and the test calculations can be calculations based on historical data and existing requirements; in this embodiment, the insulator test parameters include the sectional flexural modulus W, the stability coefficient φ of the insulator under axial compression, the elastic modulus E of the insulator, the moment of inertia I of the section, etc.;

[0053] For the stability coefficient φ of the insulator under axial compression, in this embodiment, an algorithm combining a fitting empirical formula and the Perry formula is adopted, which is fitted in the form of the Perry formula based on a large number of finite element analyses and experimental studies, with high accuracy and convenient calculation;

[0054] For the sectional flexural modulus W, it can be calculated by the following formula:

[0055] W = I / Ymax

[0056] where I is the moment of inertia with respect to the neutral layer; Ymax is the maximum distance with respect to the neutral layer;

[0057] where, when calculating the moment of inertia I, the product of the calculated process area element dA and the square of its distance to the z-axis or y-axis, y 2 dA or z 2 dA, are respectively called the moment of inertia or the second moment of the cross-section of this area element with respect to the z-axis or y-axis. The moment of inertia with respect to the Z-axis: IZ = ∫y^2dA. The moment of inertia with respect to the Y-axis;

[0058] Step 130, determine whether the calculated material strength all meets the material strength design requirements;

[0059] The calculated material strength includes flexural strength, compressive strength, tensile strength, and deflection deformation;

[0060] Furthermore, determining whether the calculated material strength all meets the material strength design requirements includes determining whether the flexural strength meets the flexural strength design requirements:

[0061] The flexural strength judgment formula is:

[0062]

[0063] where, M x and M y are respectively the preset bending moment design values about the X-axis and the Y-axis, f c is the insulator flexural strength design requirement; the W x and W y are respectively the sectional flexural moduli with respect to the X-axis and the Y-axis, and the sectional flexural modulus is obtained according to the sectional dimensions;

[0064] Further, determining whether the calculated material strength all meets the material strength design requirements includes determining whether the compressive strength meets the compressive strength design requirements:

[0065] The compressive strength judgment formula is:

[0066]

[0067] wherein, N is the design value of the axial tension or pressure of the insulator, A is the area of the gross cross-section of the insulator, φ is the stability coefficient of the axial compression of the insulator, M is the preset bending moment design value, W is the section modulus of resistance to bending, and f p is the compressive strength design requirement of the insulator;

[0068] The stability coefficient is obtained by calculating the slenderness ratio, compressive strength, and compressive elastic modulus of the insulator; the section modulus of resistance to bending is obtained according to the section size;

[0069] Further, determining whether the calculated material strength all meets the material strength design requirements includes determining whether the tensile strength meets the tensile strength design requirements:

[0070] The judgment of the tensile strength needs to simultaneously satisfy the following formulas:

[0071] and

[0072] wherein, N is the design value of the axial tension or pressure of the insulator; A n is the area of the net cross-section of the insulator; m is the eccentric reduction coefficient of the T-shaped cross-section insulator; M is the preset bending moment design value; W is the section modulus of resistance to bending, and the section modulus of resistance to bending is obtained according to the section size; f c is the bending strength design requirement of the insulator; f t is the tensile strength design requirement of the insulator;

[0073] According to the size of the T-shaped cross-section and the resulting eccentric situation, an eccentric reduction coefficient is set; in this embodiment, the eccentric reduction coefficient m is taken as 0.7;

[0074] Further, for the strength reduction caused by the need to open holes due to the connection with other components (such as connecting fittings), an opening reduction coefficient k is set; the opening reduction coefficient has the same function as the eccentric reduction coefficient and is used for non-normal strength reduction; in this embodiment, the opening reduction coefficient m is taken as 0.7;

[0075] The formula with the opening reduction coefficient added is:

[0076]

[0077]

[0078] Further, determining whether the calculated material strength meets the material strength design requirements includes determining whether the deflection deformation amount meets the deflection deformation amount design requirements:

[0079] The formula for judging the deflection deformation amount is:

[0080] fl 3 / (3EI) ≤ Δl

[0081] Wherein, f is the end load of the insulator, l is the maximum horizontal distance of the T-shaped cross-section of the insulator, E is the elastic modulus of the insulator, I is the moment of inertia of the cross-section, and Δl is the maximum deflection deformation amount, that is, the deflection deformation amount design requirement;

[0082] In step 130, if it is judged to be satisfied, then jump to step 131, and adjust the cross-sectional dimensions of the T-shaped insulator according to a preset rule to reduce the cross-sectional area of the T-shaped insulator, and calculate the material strength under this cross-sectional area;

[0083] Further, adjusting the cross-sectional dimensions of the T-shaped insulator according to the preset rule includes:

[0084] While ensuring that the maximum horizontal length and the maximum vertical length of the cross-section of the T-shaped insulator remain unchanged, enlarge or reduce the area of the cross-section according to a preset adjustment coefficient;

[0085] The shape of the T-shaped cross-section includes a standard T-shaped cross-section and a T-shaped cross-section with an arc having a preset curvature provided at the upper edge;

[0086] Further, after calculating the material strength under the current cross-sectional area, step 130 is executed again for judgment. If it is still satisfied, the cross-sectional dimensions are continuously adjusted, and it is judged again whether the material strength design requirements are met until the material strength design requirements are not met;

[0087] If not satisfied, then execute step 132:

[0088] Step 132, take the cross-sectional dimensions that finally meet the material strength design requirements as the optimal cross-sectional dimensions of the T-shaped cross-section column composite insulator;

[0089] Further, if the material strength calculated based on the initial cross-sectional dimensions does not meet the material strength design requirements, the cross-sectional dimensions of the T-shaped insulator are adjusted according to a preset rule to increase the cross-sectional area of the T-shaped insulator, and the material strength under this cross-sectional area is calculated and compared with the material strength design requirements. If it still does not meet the requirements, the cross-sectional dimensions are adjusted continuously, and it is determined again whether the material strength design requirements are met until the material strength design requirements are met.

[0090] The cross-sectional dimensions that meet the material strength design requirements are taken as the optimal cross-sectional dimensions of the T-shaped cross-section column-type composite insulator.

[0091] Figure 2 It is a schematic diagram of a T-shaped cross-section column-type insulator device according to a specific embodiment of the present invention, as Figure 2 shown, the T-shaped cross-section column-type insulator device includes:

[0092] An insulating core rod 210, the cross-section of the insulating core rod 210 is set to be T-shaped, and the cross-sectional dimensions of the insulating core rod are obtained by a preset method according to the external load of its intended use environment and the axisymmetric characteristics of the T-shaped cross-section; the insulating core rod 210 is used to ensure the mechanical properties of the insulator.

[0093] Further, the insulating core rod 210 is integrally formed by a thermosetting epoxy resin reinforced with glass fibers; the reinforcement methods include winding, pultrusion, and vacuum impregnation.

[0094] A connecting fitting 220, the connecting fitting 220 is used to connect the column-type composite insulator with the components of the power transmission and transformation equipment, so that the column-type composite insulator is reliably connected with the components of the power transmission and transformation equipment.

[0095] Further, the connecting fitting 220 is made of cast steel material with a surface hot-dip galvanized treatment, and the connecting fitting 220 and the made components are fixed by welding.

[0096] An insulating jacket 230, the insulating jacket 230 includes a plurality of umbrella skirts and a sheath, the insulating jacket 230 is used to protect the insulating core rod 210; the umbrella skirts are vertically arranged on the sheath to increase the creepage distance of the T-shaped cross-section column-type insulator; the sheath is closely attached to the insulating core rod 210.

[0097] Further, the insulating jacket 230 is formed by thermally curing silicone rubber in a preset mold; the forming methods of the plurality of umbrella skirts and the sheath of the insulating jacket 230 include integral forming and forming by an extrusion-through-umbrella process; the shapes of the umbrella skirts include circular and T-shaped.

[0098] Further, the insulator device includes one or more series-connected insulating core rods 210, and the plurality of insulating core rods 210 are connected by connection fittings 220;

[0099] Further, the connection manner between the insulating core rod 210 and the connection fitting 220 is fixed connection through bolts and limit grooves; one section of the insulating core rod 210 has bolt holes and limit grooves matching the connection fitting 220, so that after the insulating core rod 210 and the connection fitting 220 are inserted together, they are fixed by bolts;

[0100] Further, the connection manner between the insulating core rod 210 and the connection fitting 220 is fixed connection through a mortise and tenon structure; one end of the insulating core rod 210 is inserted with the connection fitting through a mortise and tenon, and is fixedly connected by insulating wedges arranged on the insertion surface;

[0101] Further, one end of the connection fitting 220 is provided with a jack, and the inner contour of the jack matches the outer contour of the insulating core rod 210; the insulating core rod 210 does not need to be drilled or have a special shape, and the insulating core rod 210 and the connection fitting 220 are connected by an insertion method;

[0102] Further, the device includes one or more series-connected insulating core rods 210, and the plurality of insulating core rods 210 are directly connected by a preset connection manner; the connection manner includes fixed connection through bolts and limit grooves and fixed connection through a mortise and tenon structure;

[0103] Further, one or more straight lines of the outer contour of the T-shaped cross-section of the insulating core rod 210 and the corresponding insulating jacket 230 are set as curved lines with a preset curvature, and each right angle of the outer contour is set as an arc chamfer, so as to reduce the accumulation of foreign objects on the surface of the insulator;

[0104] Further, the axis of symmetry of the T-shaped cross-section column type insulator device is perpendicular to the ground, and the application environment of the device includes an electric power scenario with axisymmetric stress; in an electric power scenario with axisymmetric stress, the insulator devices at the symmetric parts at both ends of the T-shaped cross-section are evenly stressed, and the T-shaped cross-section column type insulator device can provide greater material strength to obtain a smaller cross-sectional area and a smaller weight while ensuring that the strength meets the requirements, thereby ensuring operation safety.

[0105] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present disclosure can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0106] Those skilled in the art can understand that the modules in the devices in the embodiments can be adaptively changed and set in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and in addition, they can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive, any combination can be adopted to combine all the features disclosed in this specification (including the accompanying claims, abstract and drawings) and all the processes or units of any method or device so disclosed. Unless otherwise explicitly stated, each feature disclosed in this specification (including the accompanying claims, abstract and drawings) can be replaced by an alternative feature providing the same, equivalent or similar purpose. The step numbers involved in this specification are only used to distinguish each step, and do not limit the time or logical relationship between each step. Unless explicitly defined in the text, the relationship between each step includes various possible situations.

[0107] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present disclosure and forms different embodiments. For example, any one of the embodiments claimed in the claims can be used in any combination.

[0108] Each component embodiment of the present disclosure can be implemented in hardware, or implemented as a software module running on one or more processors, or implemented in combination thereof. The present disclosure can also be implemented as a device or system program (for example, a computer program and a computer program product) for executing part or all of the methods described herein. Such a program implementing the present disclosure can be stored on a computer-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0109] It should be noted that the above embodiments illustrate the present disclosure rather than limit the present disclosure, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the existence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the existence of a plurality of such elements. The present disclosure can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several systems, several of these systems can be embodied by the same hardware item.

[0110] The above are only specific embodiments of the present disclosure. It should be noted that for those of ordinary skill in the art, several improvements, modifications, and variations can be made without departing from the spirit of the present disclosure, and these improvements, modifications, and variations should all be considered to fall within the protection scope of this application.

Claims

1. A calculation method for the optimal cross-sectional dimensions of a T-shaped cross-section column composite insulator, the method comprising: The cross-section of the insulating core rod of the T-shaped cross-section column composite insulator is T-shaped; Preset the material strength design requirements according to the external load of the environment where the T-shaped cross-section column composite insulator is to be used and the T-shaped cross-section axisymmetric characteristics of the insulating core rod of the T-shaped cross-section column composite insulator; the material strength includes flexural strength, compressive strength, and tensile strength; the T-shaped cross-section axisymmetric characteristics include the design requirements for each region of the T-shaped cross-section determined by the centroid position and the axis of symmetry of the T-shaped cross-section column composite insulator; Calculate the material strength of the T-shaped cross-section column composite insulator according to the preset initial cross-section size of the T-shaped cross-section column composite insulator and the test parameters of the T-shaped cross-section column composite insulator; Judge whether the calculated material strength all meets the material strength design requirements; If it meets, adjust the cross-section size of the T-shaped insulator according to the preset rules to reduce the cross-section area of the T-shaped cross-section column composite insulator, calculate the material strength under this cross-section area, and compare it with the material strength design requirements; if it still meets, continue to adjust the cross-section size and judge again whether it meets the material strength design requirements until it does not meet the material strength design requirements; When it does not meet, take the cross-section size that meets the material strength design requirements last time as the optimal cross-section size of the T-shaped cross-section column composite insulator.

2. The method according to claim 1, characterized in that, The judgment of whether the calculated material strength meets the material strength design requirements includes: If the material strength calculated according to the initial cross-section size does not meet the material strength design requirements, adjust the cross-section size of the T-shaped cross-section column composite insulator according to the preset rules to increase the cross-section area of the T-shaped cross-section column composite insulator, calculate the material strength under this cross-section area, and compare it with the material strength design requirements; if it still does not meet, continue to adjust the cross-section size and judge again whether it meets the material strength design requirements until it meets the material strength design requirements; Take the cross-section size that meets the material strength design requirements as the optimal cross-section size of the T-shaped cross-section column composite insulator.

3. The method according to claim 2, wherein: The adjustment of the cross-section size of the T-shaped cross-section column composite insulator according to the preset rules includes: Under the condition of ensuring that the maximum horizontal length and the maximum vertical length of the cross-section of the T-shaped cross-section column composite insulator remain unchanged, enlarge or reduce the area of the cross-section by a preset adjustment coefficient; The shape of the T-shaped cross-section includes a standard T-shaped cross-section and a T-shaped cross-section in which one or more straight lines of the outer contour are set as arcs with a preset curvature.

4. The method according to claim 1, characterized in that: The judgment of whether the calculated material strength all meets the material strength design requirements includes judging whether the flexural strength meets the flexural strength design requirements: The flexural strength judgment formula is: Among them, M x and M y are respectively the design values of the bending moments about the X-axis and the Y-axis, and f c is the design requirement for the bending strength of the T-shaped column composite insulator; the W x and W y are respectively the section modulus of resistance to bending about the X-axis and the Y-axis, and the section modulus of resistance to bending is obtained by calculating according to the section size.

5. The method according to claim 1, wherein: The judgment of whether the calculated material strength all meets the material strength design requirements includes judging whether the compressive strength meets the compressive strength design requirements: The compressive strength judgment formula is: Wherein, N is the design value of the axial tension or pressure of the T-shaped cross-section column type composite insulator, A is the area of the gross cross-section of the insulating core rod of the T-shaped cross-section column type composite insulator, φ is the stability coefficient of the T-shaped cross-section column type composite insulator under axial compression, M is the preset bending moment design value, W is the section modulus of resistance to bending, and f p is the design requirement for the compressive strength of the T-shaped cross-section column type composite insulator; The stability coefficient is calculated through the slenderness ratio, compressive strength, and compressive elastic modulus of the T-shaped cross-section column composite insulator; the section modulus of resistance to bending is calculated according to the cross-section size.

6. The method according to claim 1, wherein: Determining whether the material strength obtained by the judgment calculation meets the material strength design requirements includes determining whether the tensile strength meets the tensile strength design requirements: The determination of the tensile strength needs to simultaneously meet the following formula: and Wherein, N is the design value of the axial tension or pressure of the T-shaped cross-section column composite insulator; A n is the area of the net cross-section of the insulating core rod of the T-shaped cross-section column composite insulator; m is the eccentric reduction coefficient of the T-shaped cross-section column composite insulator; M is the preset bending moment design value; W n is the section modulus of resistance to bending, and the section modulus of resistance to bending is obtained by calculating according to the section size; f c is the design requirement for the bending strength of the T-shaped cross-section column composite insulator; f t is the design requirement for the tensile strength of the T-shaped cross-section column composite insulator.

7. A T-shaped cross-section column type composite insulator device, the device comprising: An insulating core rod, the cross-section of the insulating core rod is set to a T shape, and the cross-sectional dimensions of the insulating core rod are preset with material strength design requirements according to the external load of its intended use environment and the axisymmetric characteristics of the T-shaped cross-section; the material strength includes bending strength, compressive strength, and tensile strength; the axisymmetric characteristics of the T-shaped cross-section include the design requirements of each region of the T-shaped cross-section determined by the centroid position and the axis of symmetry of the T-shaped cross-section column composite insulator; the insulating core rod is used to ensure the mechanical properties of the T-shaped cross-section column composite insulator; A connecting fitting, the connecting fitting is used to connect the T-shaped cross-section column composite insulator and the power transmission and transformation equipment component, so that the T-shaped cross-section column composite insulator and the power transmission and transformation equipment component are reliably connected; An insulating outer sheath, the insulating outer sheath includes a plurality of umbrella skirts and a sheath, and the insulating outer sheath is used to protect the insulating core rod; the umbrella skirts are vertically arranged on the sheath to increase the creepage distance of the T-shaped cross-section column composite insulator; the sheath is closely attached to the insulating core rod; The axis of symmetry of the T-shaped cross-section column composite insulator device is perpendicular to the ground, and the application environment of the device includes a power scenario with axisymmetric stress.

8. The device according to claim 7, characterized in that: The insulating core rod is integrally formed by a thermosetting epoxy resin reinforced with glass fiber; the reinforcement methods include winding, drawing, and vacuum impregnation.

9. The device according to claim 7, characterized in that: The connecting fitting is made of a cast steel material with a surface hot-dip galvanized treatment.

10. The device according to claim 7, characterized in that: The insulating outer sheath is formed by thermostatic curing of silicone rubber in a preset mold; the forming methods of the plurality of umbrella skirts and the sheath of the insulating outer sheath include integral forming and forming by an extrusion-through-umbrella process; the shapes of the umbrella skirts include circular and T-shaped.

11. The device according to claim 7, characterized in that: The device includes one or more series-connected insulating core rods, and the plurality of insulating core rods are connected by connecting fittings.

12. The device according to claim 11, wherein: The connection method between the insulating core rod and the connecting fitting is fixed connection through bolts and a limiting groove; one end of the insulating core rod has bolt holes and a limiting groove matching the connecting fitting, so that after the insulating core rod and the connecting fitting are inserted together, they are fixed by bolts.

13. The device according to claim 11, characterized in that: The connection method between the insulating core rod and the connecting fitting is fixed connection through a mortise and tenon structure; one end of the insulating core rod is inserted with the connecting fitting through a mortise and tenon, and is fixedly connected by an insulating wedge nail arranged on the insertion surface.

14. The device according to claim 7, characterized in that: The device includes one or more series-connected insulating core rods, and the plurality of insulating core rods are directly connected through a preset connection method; the connection methods include fixed connection through bolts and a limiting groove and fixed connection through a mortise and tenon structure.

15. The device according to claim 7, characterized in that: One or more straight lines of the outer contour of the T-shaped cross-section of the insulating core rod and the corresponding insulating outer sheath are set as curved lines with a preset curvature, and each right angle of the outer contour is set as an arc chamfer, so as to reduce the accumulation of foreign objects on the surface of the T-shaped cross-section column composite insulator.

Images